Casting apparatus.



' G. F. MQKBE I W.' P. SCHILLING.

oAsTING APPARATUS. PPLIUATION FILED MAR. 10l 1909. BENEWBD AUG. 5, 1911.

1;O19,F9IO5. Patgnted Mar. 12", 1912.

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` G. P. MoKEE: W. F. SCHILLING.

CASTING APPARATUS. APPLICATION Hmm nu. 16, 1909. nmmwnn AUG. s, 1an.

1,019,905, Patented Manlz, 1912.

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WITNESSES l I INVENTORS UNITED sTATEs PATENT oEEIoE.

GEORGE F. MCKEE AND WILLIAM AIF'. SCHILLING, 0F ASPINWALL, PENNSYLVANIA., ASSIGNORS TO McKEE-SCHILLING PERMANENT MOLD COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CASTING- APPARATUS.

Specification of Letters Patent.

Patented Mar. 12, 1912.

Application led March 10, 1909. Serial No. 482.511. Renewed August 5, 1911. Serial No. 642,491.

To all whom it may concern:

Be it known that we, GEORGE F. MCKEE and WILLIAM F. SCHILLING, citizens of the United States, residing at Aspinwall, in the county of Allegheny and State of Pennsylvania, have invented certain Inew and useful Improvements in Casting Apparatus, of which the following is a specification.

Our invention relates to permanent molding apparatus, and particularly to permanent collapsible cores for use in molds. It has for its primary objects: the provision of an improved arrangementof collapsible core; the provision of self adjusting or self-assembling collapsible core; and the provision of improved heading or venting means. Our invention is disclosed in the accompanying drawings, wherein Figure 1 is a side elevation, partly in section, of a mold for making pipe flanges, showing our collapsible core yarrangement in section on the line I-I of Figure 2,

Figure 2 is a view of the top of the core,

Figure 3 is a view of the bottom of the core, and

Figure 4 is a section through the core on the line IV-IV of Figure 2.

In Figure 1 we have shown our invention applied to a mold for making pipe flanges, and therein the mold 1 is divided horizontally into two parts adapted to contain the casting 2, and supported by the framework 3. Referring more particularly to the core comprising our invention, it will be seen that we provide a tapered central pin or plug 4, mounted on the plate 5 and 'surrounded by a plurality of core-sections 6, 6, 6, 6 and 7, 7, 7, 7, which are tapered with respect to the central pin and with respect to each other (see Figures 1, 2 and 3), and which are held against lateral displacement by means of the ring 8, which' is loosely fastened to the sections 7 by means of screws 9. The central pin 4 is provided with a tapered recessed portion 10, into which project the extended portions or lugs 11-11-11-11 and 12-12-12-12, formed respectively on the vsurrounding sections 6 and 7 (see Figures 1 and 4). It will be observed that the set of lugs 11 on the sections 6 are longer than the lugs 12 `on the sections 7, and that the recessed portion 10 of the central pin 4 is longer than both sets of lugs,l

the arrangement constituting a lost motion device, the purpose of which will be more fully set forth hereinafter. The plate 5 is supported by another plate 13, to which is mounted the piston rod 14, operated by the piston 15 in the cylinder 16. The cylinder 16 is suitably provided with means for admitting fluid pressure, which is the preferred means for operating our device, although other means may be equally Well employed. The central pin and the surrounding wedge sections are tapered in order to permit the sections to move inward toward the center of the core while the central pin is being moved downwardly, for the purpose of decreasing the cross-sectional area of the core so that it may be freely withdrawn from the casting, which exerts a pressure on the core due to the shrinkage of the metal as it cools.

'The device is vented of air and gases formed during the pouring by means of an opening or vent 17 formed in the mold portion l adjacent the surface of the core.

The operation of the device is as follows, referring to the positions of the parts as indicated in Figure 1: When it is desired to withdraw the core' from the mold, pressure is admitted to the upper end of the cylinder 16, moving the piston 15 downwardly and imparting a similar movement to the central pin 4 by means of the piston rod 14. During the first part of the movement of the central pin, owing to the lost motion connection between the central pin and the surrounding sections, the latter do not move longitudinally and arel held by the pinch or friction hold of the contracted casting 2. They do, however, move slightly inward toward the center, which movement is due to their tapered fit with the central pin and with one another, as heretofore explained. As the central pin continuesitsI downward movement the lugs 11 on the sections 6 are engaged by the upper face of the recess 10, and the sections 6 are thereby caused to move with the central pin, the remaining sections 7 having a still further movement toward the center. The lu`gs 12 are 'next engaged by gthe upper face of the recess as the central pin continues its movement, and thereafter the core travels as a unit. This downward and inward movement reduces ythe castings produced, etc.

tages ywillreadily occur to those 'familiar the cross-sectional area of the whole core, and the instant that the sections are free from the friction hold of the casting, they drop downward on the plate 5 and are thereby positioned. The core is then ready to be reinstatedl into the mold for another pouring. It is to be observed that the ring 8, which holds the sections from lateral displacement in respect to the central pin, has a loose fit with the screws 9 -in order to permit the sections to move inwardly as the central pin' moves downwardly.

It is to be noted that the plate 5 could be dispensed with., inasmuch as the lugs 11 and 12 and the recess portion 10 would hold the sections in longitudinal position with respect to the central pin. It is preferable however to provide such a plate in order to relieve the parts of any undue straining, and to hold the ring 8A in positive position where the latter forms a part of the mold, as is shown in Figure 1.

By the foregoing construction we secure a core of simple construction, and one that is adapted for repeated use, and one which is selfassembling or self-positioning, whereby it is always ready for use. The advantages of the construction are apparent: for instance, the reduced costof continuous production, the improvedquality and grade of Other advanwith the art. f

Having thus described our invention and illustrated its use, what we claim asv new nation a central pin, a plurality of core sections arranged thereabout and lost motion connections between the central pin and the sald core sections adapted to permit successive movement of the core sections.

3. A collapsible core comprising in combination a central pin, a plurality of tapered core sections arranged thereabout, lost motion connections between the central pin and the said sections, and-means for holding the sections against lateral displacement.

4:..A collapsible core comprising in combination a central pin, sets of wedge sections `arranged thereabout, and lost motion contions, means for limiting the lolligitudinalv movement of the sections, means for limiting the movement of the sections away from the center of the core and means secured to one of the sections and adapted to move all the sections to operative position.

7. A collapsible core comprising in combination a plurality of interlocking wedge sections collapsible by therelative longitudinal movement of the sections.

8. In combination in a. molding lapparatus, a mold portion, a collapsible core and a vent formed in adjacent surfaces of the mold portion and the collapsible core.

9. In combination in a self assembling collapsible core, a plurality of wedge sections collapsible by the relative longitudinal movement of the sections, means for limiting the longitudinal movement of the sections, and means secured to one of the sections adapted to move all the sections to assembled position. v

10. In combination in a casting apparatus, a support carrying mold portions pivotally mounted on one another, a collapsible core comprised of wedge sections movable in the mold portions, and a vent formed in adjacent surfaces of the mold portions and the core sections whereby the mold portions may be readily separated from the formed cast- Il. In combination in a casting apparatus, separable mold members,` a support therefor, a core movable through the mold members, and a vent. formed in the adjacent surfaces of the mold members and the core, and means for moving the core to operative and inoperative positlons.

12. In combination in a casting apparatus, a support, a pair of mold` members hinged together and horizontally mounted on the support, a collapsible core movable l through the mold members, and means for moving the core to operative and inoperative positions.

13. In combination in a casting apparatus, a support, a pair of mold members hinged together andV horizontally mounted on the support, a collapsible core movable means for moving the coreto operative and inoperative positions, and means adapted to re-position the core sections after the core has been collapsed.

15. In combination in a casting apparatus, a support, a pair of mold members hinged together and horizontally mounted on the support, a collapsible core comprised of wedge sections movable in the mold members, means for holding the wedge sections against lateral displacement and for positively positioning the said sections in the mold members, a key section for collapsing the core sections, and means for moving the core to operative and inoperative positions.

16. In combination in a casting apparatus, a pair of mold members hinged together and horizontally mounted on the support, a collapsible core comprised of wedge sections movable in the mold members, a key section for collapsing the'core, a plate secured to the key section and adapted to re-position the core sections after the core has been collapsed, and means for moving the core to operative and inoperative positions.

17. In combination in a casting apparatus, a support, mold members pivotally mounted on one another carried thereby, a core movable through the mold members transverse the plane of the mold members and means for advancing and retracting the core into and from the mold members.

18. In' combination in a casting apparatus, a support, mold members mounted on one another carried thereby, a core movable through the mold members transverse the plane of the mold members and adapted to form a tight joint with the said mold members when in operative position, and means for advancing and retractin-g the core into and from the mold members.

19. A casting apparatus comprising in combination, a support, mold members mounted on one another and carried by the support, a collapsible core movable through the said mold members transverse the plane of the mold members, and mea s for advancing and retracting the collap ible core into and from the mold members.

20. A casting apparatus comprising in combination, a support, a pair of mold members mounted on one another and carried by the support, a collapsible core movable through the mold members transverse the plane of the mold members andadapted to form a tight joint with each of the mold members when in operativeV position, and means for advancing and retracting the eolpsible core into and from the mold mem- 21. A collapsiblecore consisting of a plu GEORGE F. MoKEE. WILLIAM F. SCHILLING.

Witnesses:

HARRY L. LECHNER, ARcHWoRTH MARTIN. 

